Circular financing adds a big new risk.Nvidia's (NVDA 0.27%) announcement that it will invest up to 100billioninOpenAIisbeinghailedbythecompanyasamassivebetonthefutureofartificialintelligence(AI).Still,investorsshouldtakeacloserlookatwhatisreallygoingonhere.ThemoneyOpenAIreceiveswillultimatelybeplowedrightbackintoNvidiahardware,mostlythroughOracle′scloudbuildout,wherethetwocompaniesrecentlysignedamassive300 billion deal. OpenAI plans to deploy N ...